How do you create an autoscaling GCE server group in Spinnaker? In capacity it just has number of instances and I cannot see anything that mentions autoscaling. This should be possible since GCE instance groups can be told to autoscale.
When you select a GCE server group, the right-hand side details pane has a link to 'Create new autoscaling policy' in the Autoscaling section.
Once you create the policy, you can edit it via the same set of controls.
A configured autoscaler will be inherited when you clone a server group as well.
Thanks, -Matt